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https://www.readbyqxmd.com/read/28346388/thermal-condensation-of-glycine-and-alanine-on-metal-ferrite-surface-primitive-peptide-bond-formation-scenario
#1
Md Asif Iqubal, Rachana Sharma, Sohan Jheeta, Kamaluddin
The amino acid condensation reaction on a heterogeneous mineral surface has been regarded as one of the important pathways for peptide bond formation. Keeping this in view, we have studied the oligomerization of the simple amino acids, glycine and alanine, on nickel ferrite (NiFe₂O₄), cobalt ferrite (CoFe₂O₄), copper ferrite (CuFe₂O₄), zinc ferrite (ZnFe₂O₄), and manganese ferrite (MnFe₂O₄) nanoparticles surfaces, in the temperature range from 50-120 °C for 1-35 days, without applying any wetting/drying cycles...
March 27, 2017: Life
https://www.readbyqxmd.com/read/28334209/comparative-study-of-chemosensory-organs-of-shrimp-from-hydrothermal-vent-and-coastal-environments
#2
Magali Zbinden, Camille Berthod, Nicolas Montagné, Julia Machon, Nelly Léger, Thomas Chertemps, Nicolas Rabet, Bruce Shillito, Juliette Ravaux
The detection of chemical signals is involved in a variety of crustacean behaviors, such as social interactions, search and evaluation of food and navigation in the environment. At hydrothermal vents, endemic shrimp may use the chemical signature of vent fluids to locate active edifices, however little is known on their sensory perception in these remote deep-sea habitats. Here, we present the first comparative description of the sensilla on the antennules and antennae of 4 hydrothermal vent shrimp (Rimicaris exoculata, Mirocaris fortunata, Chorocaris chacei, and Alvinocaris markensis) and of a closely related coastal shrimp (Palaemon elegans)...
February 22, 2017: Chemical Senses
https://www.readbyqxmd.com/read/28328982/highlighting-of-quorum-sensing-lux-genes-and-their-expression-in-the-hydrothermal-vent-shrimp-rimicaris-exoculata-ectosymbiontic-community-possible-use-as-biogeographic-markers
#3
Simon Le Bloa, Lucile Durand, Valérie Cueff-Gauchard, Josiane Le Bars, Laure Taupin, Charlotte Marteau, Alexis Bazire, Marie-Anne Cambon-Bonavita
Rimicaris exoculata is a caridean shrimp that dominates the fauna at several hydrothermal vent sites of the Mid-Atlantic Ridge. It has two distinct and stable microbial communities. One of these epibiontic bacterial communities is located in the shrimp gut and has a distribution and role that are poorly understood. The second colonizes its enlarged gill chamber and is involved in host nutrition. It is eliminated after each molt, and has colonization processes reminiscent of those of a biofilm. The presence and expression of genes usually involved in quorum sensing (QS) were then studied...
2017: PloS One
https://www.readbyqxmd.com/read/28296889/investigation-of-bacterial-communities-within-the-digestive-organs-of-the-hydrothermal-vent-shrimp-rimicaris-exoculata-provide-insights-into-holobiont-geographic-clustering
#4
Dominique A Cowart, Lucile Durand, Marie-Anne Cambon-Bonavita, Sophie Arnaud-Haond
Prokaryotic communities forming symbiotic relationships with the vent shrimp, Rimicaris exoculata, are well studied components of hydrothermal ecosystems at the Mid-Atlantic Ridge (MAR). Despite the tight link between host and symbiont, the observed lack of spatial genetic structure seen in R. exoculata contrasts with the geographic differentiation detected in specific bacterial ectosymbionts. The geographic clustering of bacterial lineages within a seemingly panmictic host suggests either the presence of finer scale restriction to gene flow not yet detected in the host, horizontal transmission (environmental selection) of its endosymbionts as a consequence of unique vent geochemistry, or vertically transmitted endosymbionts that exhibit genetic differentiation...
2017: PloS One
https://www.readbyqxmd.com/read/28276199/new-insights-into-a-hot-environment-for-early-life
#5
REVIEW
Jianghong Dai
Investigating the physical-chemical setting of early life is a challenging task. In this contribution, I attempt to introduce a provocative concept from cosmology-cosmic microwave background (CMB), which is the residual thermal radiation from a hot early Universe-to the field. For this purpose, I revisit a recently deduced biomarker, the 1,6-anhydro bond of sugars in bacteria. In vitro, the 1,6-anhydro bond of sugars reflects and captures residual thermal radiation in thermochemical processes and therefore is somewhat analogous to CMB...
March 9, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28273353/do-larvae-from-deep-sea-hydrothermal-vents-disperse-in-surface-waters
#6
Takuya Yahagi, Hiromi Kayama Watanabe, Shigeaki Kojima, Yasunori Kano
Larval dispersal significantly contributes to the geographic distribution, population dynamics and evolutionary processes of animals endemic to deep-sea hydrothermal vents. Little is known as to the extent that their larvae migrate vertically to shallower waters and experience stronger currents and richer food supplies. Here, we first provide evidence from early life-history traits and population genetics for the surface dispersal of a vent species. Planktotrophic larvae of a red blood limpet, Shinkailepas myojinensis (Gastropoda: Neritimorpha: Phenacolepadidae), were cultured to observe their swimming behavior and to evaluate the effects of temperature on survival and growth...
March 8, 2017: Ecology
https://www.readbyqxmd.com/read/28252057/evidence-for-early-life-in-earth-s-oldest-hydrothermal-vent-precipitates
#7
Matthew S Dodd, Dominic Papineau, Tor Grenne, John F Slack, Martin Rittner, Franco Pirajno, Jonathan O'Neil, Crispin T S Little
Although it is not known when or where life on Earth began, some of the earliest habitable environments may have been submarine-hydrothermal vents. Here we describe putative fossilized microorganisms that are at least 3,770 million and possibly 4,280 million years old in ferruginous sedimentary rocks, interpreted as seafloor-hydrothermal vent-related precipitates, from the Nuvvuagittuq belt in Quebec, Canada. These structures occur as micrometre-scale haematite tubes and filaments with morphologies and mineral assemblages similar to those of filamentous microorganisms from modern hydrothermal vent precipitates and analogous microfossils in younger rocks...
March 1, 2017: Nature
https://www.readbyqxmd.com/read/28249568/by-more-ways-than-one-rapid-convergence-at-hydrothermal-vents-shown-by-3d-anatomical-reconstruction-of-gigantopelta-mollusca-neomphalina
#8
Chong Chen, Katsuyuki Uematsu, Katrin Linse, Julia D Sigwart
BACKGROUND: Extreme environments prompt the evolution of characteristic adaptations. Yet questions remain about whether radiations in extreme environments originate from a single lineage that masters a key adaptive pathway, or if the same features can arise in parallel through convergence. Species endemic to deep-sea hydrothermal vents must accommodate high temperature and low pH. The most successful vent species share a constrained pathway to successful energy exploitation: hosting symbionts...
March 1, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/28241423/metabolic-profiling-as-a-screening-tool-for-cytotoxic-compounds-identification-of-3-alkyl-pyridine-alkaloids-from-sponges-collected-at-a-shallow-water-hydrothermal-vent-site-north-of-iceland
#9
Eydis Einarsdottir, Manuela Magnusdottir, Giuseppe Astarita, Matthias Köck, Helga M Ögmundsdottir, Margret Thorsteinsdottir, Hans Tore Rapp, Sesselja Omarsdottir, Giuseppe Paglia
Twenty-eight sponge specimens were collected at a shallow water hydrothermal vent site north of Iceland. Extracts were prepared and tested in vitro for cytotoxic activity, and eight of them were shown to be cytotoxic. A mass spectrometry (MS)-based metabolomics approach was used to determine the chemical composition of the extracts. This analysis highlighted clear differences in the metabolomes of three sponge specimens, and all of them were identified as Haliclona (Rhizoniera) rosea (Bowerbank, 1866). Therefore, these specimens were selected for further investigation...
February 22, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28216337/identification-and-gene-expression-of-multiple-peptidoglycan-recognition-proteins-pgrps-in-the-deep-sea-mussel-bathymodiolus-azoricus-involvement-in-symbiosis
#10
Camille Détrée, François H Lallier, Arnaud Tanguy, Jean Mary
The relationship between the deep-sea mussel Bathymodiolus azoricus and its thiotrophic (SOX) and methanotrophic (MOX) symbionts has been ecologically and functionally well studied. Endosymbiosis is common in deep-sea hydrothermal vent fauna, yet little is known about the molecular mechanisms underlying the regulation of interactions between host and symbionts. In this study we focused on a group of pattern recognition receptors (PRR), called PGRPs that are able to recognize the peptidoglycan of bacterial cell wall...
February 12, 2017: Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
https://www.readbyqxmd.com/read/28215329/biotechnological-applications-of-marine-enzymes-from-algae-bacteria-fungi-and-sponges
#11
S Parte, V L Sirisha, J S D'Souza
Diversity is the hallmark of all life forms that inhabit the soil, air, water, and land. All these habitats pose their unique inherent challenges so as to breed the "fittest" creatures. Similarly, the biodiversity from the marine ecosystem has evolved unique properties due to challenging environment. These challenges include permafrost regions to hydrothermal vents, oceanic trenches to abyssal plains, fluctuating saline conditions, pH, temperature, light, atmospheric pressure, and the availability of nutrients...
2017: Advances in Food and Nutrition Research
https://www.readbyqxmd.com/read/28209839/complete-genome-sequence-of-the-hyperthermophilic-piezophilic-archaeon-pyrococcus-kukulkanii-ncb100-isolated-from-the-rebecca-s-roost-hydrothermal-vent-in-the-guaymas-basin
#12
Philippe M Oger, Nolwenn Callac, Christine Oger-Desfeux, Sandrine Hughes, Benjamin Gillet, Mohamed Jebbar, Anne Godfroy
Members of the order Thermococcales are common inhabitants of high-temperature hydrothermal vent systems (black smokers) that are represented in clone libraries mostly by isolates from the Thermococcus genus. We report the complete sequence of a novel species from the Pyrococcus genus, P. kukulkanii strain NCB100, which has been isolated from a flange fragment of the Rebecca's Roost hydrothermal vent system in the Guaymas Basin.
February 16, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28206708/physiological-metabolic-and-biotechnological-features-of-extremely-thermophilic-microorganisms
#13
REVIEW
James A Counts, Benjamin M Zeldes, Laura L Lee, Christopher T Straub, Michael W W Adams, Robert M Kelly
The current upper thermal limit for life as we know it is approximately 120°C. Microorganisms that grow optimally at temperatures of 75°C and above are usually referred to as 'extreme thermophiles' and include both bacteria and archaea. For over a century, there has been great scientific curiosity in the basic tenets that support life in thermal biotopes on earth and potentially on other solar bodies. Extreme thermophiles can be aerobes, anaerobes, autotrophs, heterotrophs, or chemolithotrophs, and are found in diverse environments including shallow marine fissures, deep sea hydrothermal vents, terrestrial hot springs-basically, anywhere there is hot water...
February 16, 2017: Wiley Interdisciplinary Reviews. Systems Biology and Medicine
https://www.readbyqxmd.com/read/28205388/hydrogen-or-formate-alternative-key-players-in-methanogenic-degradation
#14
REVIEW
Bernhard Schink, Dominik Montag, Anja Keller, Nicolai Müller
Hydrogen and formate are important electron carriers in methanogenic degradation in anoxic environments such as sediments, sewage sludge digestors, and biogas reactors. Especially in the terminal steps of methanogenesis, they determine the energy budgets of secondary (syntrophically) fermenting bacteria and their methanogenic partners. The literature provides considerable data on hydrogen pool sizes in such habitats, but little data exist for formate concentrations due to technical difficulties in formate determination at low concentration...
February 15, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28194142/respiratory-ammonification-of-nitrate-coupled-to-anaerobic-oxidation-of-elemental-sulfur-in-deep-sea-autotrophic-thermophilic-bacteria
#15
Galina B Slobodkina, Andrey V Mardanov, Nikolai V Ravin, Anastasia A Frolova, Nikolay A Chernyh, Elizaveta A Bonch-Osmolovskaya, Alexander I Slobodkin
Respiratory ammonification of nitrate is the microbial process that determines the retention of nitrogen in an ecosystem. To date, sulfur-dependent dissimilatory nitrate reduction to ammonium has been demonstrated only with sulfide as an electron donor. We detected a novel pathway that couples the sulfur and nitrogen cycles. Thermophilic anaerobic bacteria Thermosulfurimonas dismutans and Dissulfuribacter thermophilus, isolated from deep-sea hydrothermal vents, grew autotrophically with elemental sulfur as an electron donor and nitrate as an electron acceptor producing sulfate and ammonium...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28187634/a-new-species-of-the-genus-i-alvinocaris-i-williams-and-chace-1982-crustacea-decapoda-caridea-alvinocarididae-from-the-manus-basin-hydrothermal-vents-southwest-pacific
#16
Yan-Rong Wang, Zhong-Li Sha
One new species of alvinocaridid Alvinocaris kexueae sp. nov. is described from hydrothermal vents on the Manus Basin, Southwest Pacific. This is the fifteenth species in Alvinocaris Williams & Chace, 1982. The new species is easily recognized by the combination of the rostrum distinctively overreaching the distal end of the antennular peduncle, and the armature of its dorsal and ventral margins; the unarmed third abdominal segment, and by the posterior margin of the telson having one triangular tooth medially and 6 pairs unequal spines...
January 25, 2017: Zootaxa
https://www.readbyqxmd.com/read/28150576/desulfurobacterium-indicum-sp-nov-a-thermophilic-sulfur-reducing-bacterium-from-the-indian-ocean
#17
Junwei Cao, Tiphaine Birien, Nicolas Gayet, Zhaobin Huang, Zongze Shao, Mohamed Jebbar, Karine Alain
A novel sulfur-reducing bacterium, strain K6013T, was isolated from a sulfide sample collected at a depth of 2,771 m from a high-temperature hydrothermal vent in the Indian Ocean. Cells were Gram-negative, anaerobic, motile rods (0.9-2.2 × 0.4-0.6 μm). The strain grew at NaCl concentrations ranging from 1 to 4.5% (w/v) (optimum 2.5%), from pH 5 to 8 (optimum 6), and at temperatures between 40 and 75 °C (optimum 65 °C). Strain K6013T was an obligate chemolithoautotroph using thiosulfate, sulfur, and nitrate as terminal electron acceptors in the presence of H2, but not sulfate, sulfite nor nitrite...
February 1, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28144700/sediment-microbial-diversity-of-three-deep-sea-hydrothermal-vents-southwest-of-the-azores
#18
Teresa Cerqueira, Diogo Pinho, Hugo Froufe, Ricardo S Santos, Raul Bettencourt, Conceição Egas
Menez Gwen, Lucky Strike and Rainbow are the three most visited and well-known deep-sea hydrothermal vent fields in the Azores region, located in the Mid-Atlantic Ridge. Their distinct geological and ecological features allow them to support a diversity of vent communities, which are largely dependent on Bacteria and Archaea capable of anaerobic or microaerophilic metabolism. These communities play important ecological roles through chemoautotrophy, feeding and in establishing symbiotic associations. However, the occurrence and distribution of these microbes remain poorly understood, especially in deep-sea sediments...
January 31, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28119504/synchronized-chaotic-targeting-and-acceleration-of-surface-chemistry-in-prebiotic-hydrothermal-microenvironments
#19
Aashish Priye, Yuncheng Yu, Yassin A Hassan, Victor M Ugaz
Porous mineral formations near subsea alkaline hydrothermal vents embed microenvironments that make them potential hot spots for prebiotic biochemistry. But, synthesis of long-chain macromolecules needed to support higher-order functions in living systems (e.g., polypeptides, proteins, and nucleic acids) cannot occur without enrichment of chemical precursors before initiating polymerization, and identifying a suitable mechanism has become a key unanswered question in the origin of life. Here, we apply simulations and in situ experiments to show how 3D chaotic thermal convection-flows that naturally permeate hydrothermal pore networks-supplies a robust mechanism for focused accumulation at discrete targeted surface sites...
February 7, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28117546/steep-ph-gradients-and-directed-colloid-transport-in-a-microfluidic-alkaline-hydrothermal-pore
#20
Friederike M Möller, Franziska Kriegel, Michael Kieß, Victor Sojo, Dieter Braun
All life on earth depends on the generation and exploitation of ionic and pH gradients across membranes. One theory for the origin of life proposes that geological pH gradients were the prebiotic ancestors of these cellular disequilibria. With an alkaline interior and acidic exterior, alkaline vents match the topology of modern cells, but it remains unknown whether the steep pH gradients persist at the microscopic scale. Herein, we demonstrate the existence of 6 pH-unit gradients across micrometer scales in a microfluidic vent replicate...
January 24, 2017: Angewandte Chemie
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